Pass through the PlaybackRequiresUserGesture Chromium setting which
Chrome enables by default on Android.

Task-number: QTBUG-60799
Change-Id: I105fc7d558f9b67417a0047ecb1efe7677817ea4
Reviewed-by: Florian Bruhin <qt-project.org@the-compiler.org>
Reviewed-by: Peter Varga <pvarga@inf.u-szeged.hu>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>